在线测量水中的COD和酸盐对抗随机背景干扰,基于紫外可见光谱和基于物理的多任务学习
Jiacheng Liu1, Tao Yu2, Xueji Wang2
1Key Laboratory of Spectral Imaging Technology, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an 710119, China; University of Chinese Academy of Sciences, Beijing 100049, China; Department of Mechanical Engineering, National University of Singapore, 117575, Singapore.
概括
一个新的基于物理的多任务学习模型改善了水质监测. 它准确地测量化学氧气需求 (COD) 和酸盐水平,即使有来自度和颜色的背景干扰.
科学领域:
- 环境科学 环境科学
- 分析化学 分析化学
- 频谱学是一种光谱学.
背景情况:
- 由于光谱重叠和背景干扰,传统的UV-Vis光谱学难以同时测量COD和酸盐.
- 水中的度和色度会引起随机背景噪声,阻碍准确的长期分析.
研究的目的:
- 开发一种新的UV-Vis光谱定量分析模型,用于准确的在线水质监测.
- 解决在具有挑战性的水条件下测量化学氧需求 (COD) 和酸盐现有方法的局限性.
主要方法:
- 引入一个紧的双光学路径频谱检测传感器.
- 设计一个基于物理的多任务学习 (PI-MTL) 模型,整合物理知识.
- 实施多任务损失包裹策略,以适应随机背景.
主要成果:
- 该PI-MTL模型实现了高预测R2值:COD为0.941和酸盐为0.9575.
- 与PLSR相比,根的平方平均误差 (RMSE) 显著减少:COD为60.89%,酸盐为77.3%.
- 超过了基准CNN模型的表现,降低了COD的RMSE30.59%,酸盐的65.96%.
结论:
- PI-MTL模型在线多参数水质监测方面表现出卓越的性能.
- 这种方法可以长期精确测量COD和酸盐,克服随机背景干扰.
- 开发的光谱传感器和模型显示了环境监测应用的巨大潜力.
相关概念视频
01:14UV–Vis Spectrometers
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The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell.
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01:02Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview
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Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material, molecules absorb light depending on the energy required for...
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